CN202471901U - Partial discharge ultrahigh frequency detecting system for switch cabinet - Google Patents

Partial discharge ultrahigh frequency detecting system for switch cabinet Download PDF

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Publication number
CN202471901U
CN202471901U CN2012201067202U CN201220106720U CN202471901U CN 202471901 U CN202471901 U CN 202471901U CN 2012201067202 U CN2012201067202 U CN 2012201067202U CN 201220106720 U CN201220106720 U CN 201220106720U CN 202471901 U CN202471901 U CN 202471901U
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China
Prior art keywords
switch cubicle
local discharge
frequency detection
switch cabinet
superhigh frequency
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CN2012201067202U
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Chinese (zh)
Inventor
周鸣
胡海涛
瞿子明
王乃盾
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Shanghai Municipal Electric Power Co
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Shanghai Municipal Electric Power Co
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Abstract

The utility model relates to a partial discharge ultrahigh frequency detecting system for a switch cabinet. The system comprises the switch cabinet (1) and is characterized in that a ultrahigh frequency sensor (2) is arranged on the switch cabinet (1), one side of the ultrahigh frequency sensor (2) is connected with a signal conditioning unit (4) and a data acquisition card (7) through coaxial cables (3), and the data acquisition card (7) is connected with a computer (8). The partial discharge ultrahigh frequency detecting system for the switch cabinet is strong in interference-resistant capacity and high in test sensitivity and can effectively locate a partial discharge source.

Description

A kind of switch cubicle local discharge superhigh frequency detection system
Technical field
The utility model relates to a kind of detection system, particularly, relates to a kind of switch cubicle local discharge superhigh frequency detection system.
Background technology
In recent decades; Along with lasting expansion of the scale of domestic electrical network and electric pressure constantly raise; The safety problem of electric system receives people's attention day by day, safeguards that the operate as normal of power equipment carries high-quality electric energy also to become the lasting flourish inevitable requirement of national economy gradually with producing.Electrical equipment is the primary element of electric system, and its fault often becomes the inducement of the large-scale security incident of electric system.Great mass of data shows that the main cause that causes electrical equipment malfunction is the deterioration of its insulating property.The reason of insulation of electrical installation performance degradation has a lot, comprises that the equipment continuous working period is long, institute's electric pressure that applies is high and receives intense electromagnetic impact etc.But with regard to electrical equipment self, some weakness of the inner existence of insulation system are for example poured into a mould, are extruded or layer fault of construction around the inner appearance of insulation at some, then are the basic reasons that causes insulation fault.Therefore, local discharge of electrical equipment becomes the extremely important part of electric system on-line monitoring, measurement, identification and the location of shelf depreciation is also become a problem of electric system, enterprise and colleges and universities' primary study.
Switch cubicle can be safe, stable in electrical network, come into operation.But in actual motion, various insulation faults still appear in switch cubicle, especially in 10kV and above electric pressure.The fault of switch cubicle insulation aspect mainly shows as external insulation flashover breakdown over the ground; In the flashover breakdown over the ground that insulate, phase insulation flashover breakdown, lightning surge flashover breakdown; Porcelain vase sleeve pipe, capacitance graded bushing flashover, pollution flashover, puncture, blast; The lifting arm flashover, CT flashover, puncture, blast, porcelain insulator breaking etc.
Switch cubicle is meant and is used for electric system generating, transmission of electricity, distribution, electric energy conversion and has consumed effects such as break-make, control or protection; Electric pressure is in the electric equipment products of 3.6kV~550kV; Comprise that mainly primary cut-out, high voltage isolator overlap and sectionaliser with grounding switch, high voltage load switch, high pressure automatically, several big type of high-voltage actuating mechanism, high-voltage explosion-proof power distribution equipment and high-tension switch cabinet etc.The high-voltage switch gear manufacturing industry is the manufacturing important component part of power transmission and transforming equipment, in whole power industry, occupies important status.
In the insulation system of electrical equipment; The electric field intensity at each position is unequal often; When the electric field intensity in Where topical zone reached this regional breakdown field strength, discharge will appear in this zone, but discharge does not run through between two conductors that apply voltage; Be that whole insulation system does not puncture as yet, this phenomenon is referred to as shelf depreciation.Shelf depreciation can not cause that generally the connectivity of insulation punctures, but can cause the local damage of dielectric (particularly organic dielectric).If the shelf depreciation long-term existence then possibly cause the reduction of insulating medium electrical strength under certain condition.Therefore shelf depreciation is an evolution slowly to the destruction of insulator arrangement, is a kind of hidden danger for high voltage electric equipment.
In the long-time running process, the metalwork in the high-tension switch cabinet, insulating part etc. are because the defective of defective of hiding in making or generation in service can produce shelf depreciation.Practice shows that shelf depreciation is to cause apparatus insulated deterioration, the main cause of insulation fault takes place, and mostly many burst accidents in recent years is by due to the shelf depreciation.The condition that produces shelf depreciation depends on the Electric Field Distribution and the electric physical property of insulation in the insulating medium, and shelf depreciation is under high electric field intensity usually, the position generation that electrical strength is lower in insulator.
Thus, the detection to the Partial Discharge Sources of switch cubicle inside is a urgent problem.
The utility model content
For solving the problem of above-mentioned existence; The purpose of the utility model is to provide a kind of switch cubicle local discharge superhigh frequency detection system; Utilize internal or external uhf sensor to receive these electromagnetic waves and it is analyzed, thereby judge defect type and localization of fault.
For achieving the above object, the utility model adopts following technical scheme:
A kind of switch cubicle local discharge superhigh frequency detection system; Comprise switch cubicle; It is characterized in that: said switch cubicle is provided with uhf sensor, and said uhf sensor one side is through concentric cable and signal condition unit and data acquisition card connection, and said data collecting card is connected with computing machine.
According to a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided, employing be that said signal condition unit comprises amplifier and detecting circuit.
According to a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided, employing be that described amplifier is conventional amplifying circuit.
According to a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided, employing be that described detecting circuit is conventional diode detection circuit.
According to a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided, employing be that said uhf sensor is arranged on switch cubicle inside.
According to a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided, employing be that said uhf sensor is arranged on the switch cubicle outside.
According to a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided, employing be that the quantity of said uhf sensor is one or more.
The beneficial effect of a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided is: said detection system antijamming capability is strong, and measurement sensitivity is high, can effectively position Partial Discharge Sources.
Description of drawings
Fig. 1 is the synoptic diagram that connects and composes of the utility model switch cubicle local discharge superhigh frequency detection system.
Among the figure, 1, switch cubicle 2, uhf sensor 3, concentric cable 4, signal condition unit 5, amplifier 6, detecting circuit 7, data collecting card 8, computing machine.
Embodiment
Below in conjunction with accompanying drawing a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided is further explained.
The connected mode of a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided is following:
As shown in Figure 1, switch cubicle 1 is connected with uhf sensor 2, and said uhf sensor 2 one sides form with data collecting card 7 with signal condition unit 4 through concentric cable 3 and are connected in series, and said data collecting card 7 is connected with computing machine 8.Said signal condition unit 4 comprises amplifier 5 and detecting circuit 6, and described amplifier 5 is conventional amplifying circuit, and described detecting circuit 6 is conventional diode detection circuit.
Wherein, said uhf sensor 2 can be internal or external at switch cubicle 1, and promptly said uhf sensor 2 can be connected or be connected with switch cubicle 1 outside with switch cubicle 1 inboard.The quantity of said uhf sensor 2 is one or more.
The principle of work of a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided is following:
During switch cubicle generation shelf depreciation, all extremely short several nanoseconds, its corresponding frequency domain ten minutes broadness of being merely of discharge pulse rise time and duration.This pulse signal can cause electric resonance when in the switch cubicle cavity, propagating.Inspire the electromagnetic wave of frequency up to 300MHz~3GHz. during electromagnetic wave propagation, not only propagate with transverse electromagnetic wave (TEM) form.But also can set up high order transverse electric wave (TE) and transverse magnetic wave (TM).The TEM ripple is a non-dispersive wave.Can any frequency in switch, propagate. but the high more decay of frequency is fast more.TE is then different with TM, and they have cutoff frequency separately, has only when signal frequency is higher than cutoff frequency and could propagate.The coaxial configuration of switch cubicle is equivalent to a good waveguide, and signal is decayed very little within it when portion propagates, help Partial Discharge Detection.
The principle of work of a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided is exactly electromagnetic these characteristics that excite according to shelf depreciation; Utilize internal or external uhf sensor to receive these electromagnetic waves and it is analyzed, thereby judge defect type and localization of fault.
Adopt a kind of switch cubicle local discharge superhigh frequency detection system that the utility model provided, have higher sensitivity at the scene, though its centre frequency is lower; Disturb still influential; But since made an experiment on-the-spot all again indoor and have away from the urban district, voltage be the 10kV level only again, so interference is also not serious; As the commercial unit interference ratio can detect when they are shut down with strongly nearby.
Adopt a plurality of uhf sensors, measure the mistiming that they receive the ultrahigh-frequency signal of same discharge source, position according to these time differences and electromagnetic wave propagation speed then.Carry out GIS shelf depreciation location based on this principle; Time difference of the signal that will measure at the nanosecond order of magnitude; This not only requires survey record equipment to have very wide frequency band and very high sampling rate; Also require measured signal itself to have very steep initial edge, can read the initial moment of signal of nanosecond order.Obviously, the above signal of hyper band satisfies this requirement.Therefore, adopt the ultrahigh frequency method source of putting of can playing a game to position.
Involved each of the utility model installed, the connection of instrument is prior art, so concrete annexation is each other no longer narrated.

Claims (7)

1. switch cubicle local discharge superhigh frequency detection system; Comprise switch cubicle (1); It is characterized in that: said switch cubicle (1) is provided with uhf sensor (2); Said uhf sensor (2) one sides are connected with data collecting card (7) with signal condition unit (4) through concentric cable (3), and said data collecting card (7) is connected with computing machine (8).
2. a kind of switch cubicle local discharge superhigh frequency detection system according to claim 1 is characterized in that said signal condition unit (4) comprises amplifier (5) and detecting circuit (6).
3. a kind of switch cubicle local discharge superhigh frequency detection system according to claim 2 is characterized in that described amplifier (5) is conventional amplifying circuit.
4. a kind of switch cubicle local discharge superhigh frequency detection system according to claim 2 is characterized in that described detecting circuit (6) is conventional diode detection circuit.
5. a kind of switch cubicle local discharge superhigh frequency detection system according to claim 1 is characterized in that said uhf sensor (2) is arranged on switch cubicle (1) inside.
6. a kind of switch cubicle local discharge superhigh frequency detection system according to claim 1 is characterized in that said uhf sensor (2) is arranged on switch cubicle (1) outside.
7. according to claim 1,5 or 6 described a kind of switch cubicle local discharge superhigh frequency detection systems, the quantity that it is characterized in that said uhf sensor (2) is one or more.
CN2012201067202U 2012-03-20 2012-03-20 Partial discharge ultrahigh frequency detecting system for switch cabinet Active CN202471901U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012201067202U CN202471901U (en) 2012-03-20 2012-03-20 Partial discharge ultrahigh frequency detecting system for switch cabinet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012201067202U CN202471901U (en) 2012-03-20 2012-03-20 Partial discharge ultrahigh frequency detecting system for switch cabinet

Publications (1)

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CN202471901U true CN202471901U (en) 2012-10-03

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103529370A (en) * 2013-10-30 2014-01-22 国家电网公司 Partial discharge detection method for high-voltage switch cabinet
CN104166076A (en) * 2014-08-06 2014-11-26 国家电网公司 Partial discharge detecting device in high-voltage switch cabinet
CN105334433A (en) * 2014-08-07 2016-02-17 国家电网公司 Cable partial discharge detection method and device
CN108061844A (en) * 2017-12-12 2018-05-22 太仓鼎诚电子科技有限公司 A kind of high-tension switch cabinet shelf depreciation UHE online monitoring systems

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103529370A (en) * 2013-10-30 2014-01-22 国家电网公司 Partial discharge detection method for high-voltage switch cabinet
CN103529370B (en) * 2013-10-30 2016-08-17 国家电网公司 A kind of partial discharge detection method for high-voltage switch cabinet
CN104166076A (en) * 2014-08-06 2014-11-26 国家电网公司 Partial discharge detecting device in high-voltage switch cabinet
CN105334433A (en) * 2014-08-07 2016-02-17 国家电网公司 Cable partial discharge detection method and device
CN108061844A (en) * 2017-12-12 2018-05-22 太仓鼎诚电子科技有限公司 A kind of high-tension switch cabinet shelf depreciation UHE online monitoring systems

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